Meanwhile, for the far less common intrauterine device (IUD), the unplanned pregnancy rate shoots down to between 0.2 per cent and 0.8 per cent. According to Planned Parenthood, that's on par with vasectomies, female sterilization and implants at less than 1 pregnancy per 100 women a year, though another birth control method is suggested for three months after a vasectomy.

SEE: There are ways to make your birth control more effective -- here are bad birth control habits you didn't realize you had. Story continues below:

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Bad Birth Control Habits

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Pills work best if they're taken at the same time each day -- which is often difficult for women to remember.
(Photo courtesy of Flickr/canardo)

It's not as common as it once was, but antibiotics can occasionally affect the effectiveness of your birth control pill. Ask the doctor who prescribed the antibiotics about any potential interactions.
(Photo courtesy of Flickr/Sheep purple)

While it can be difficult with a new partner, avoiding the subject of birth control won't make it go away, particularly if you've already started having sex. Get past sexual histories, concerns and preferred methods out in the open as soon as possible to make this work for everyone.

Besides also being more comfortable for both partners, ensuring you have the right condom size can mean it's less slightly to break (if it's too tight) or slip off (if it's too small).
(Photo courtesy of Flickr/robertelyov)

The Pill isn't the be all and end all of birth control options - investigate alternatives if you're not all that into the Pill, or if it's giving you some adverse side effects. Options like the intrauterine device (IUD) shown here are quite common, and could even be more effective.
(Photo courtesy of Flickr/+mara)

Forgetting to take their Pill is more common than most women would like to admit, and it can certainly impact the risk of pregnancy. Missing one day is generally believed to be fine, but you should probably opt for back-up for a week after just in case.
(Photo courtesy of Flickr/Shemer)

Similarly, the first week -- and more cautious people say even month -- of starting the Pill, use a condom, as the hormones won't yet be as effective as they could be. (Photo courtesy of Flickr/Jenny Lee Silver)

Oil-based lubricants shouldn't be used with condoms, as they can break down the latex and therefore increase the risk of pregnancy. Always opt for water-based lubricants.

For birth control methods like sponges and diaphragms that require removal, women can make the mistake of taking them out too soon -- each should be removed six hours after sex, but shouldn't be kept in any longer than 30 hours.
(Photo courtesy of Flickr/Ryan Somma)

Timing
Pills work best if they're taken at the same time each day -- which is often difficult for women to remember.

Taking Antibiotics
It's not as common as it once was, but antibiotics can occasionally affect the effectiveness of your birth control pill. Ask the doctor who prescribed the antibiotics about any potential interactions.

Talking About It With Your Partner
While it can be difficult with a new partner, avoiding the subject of birth control won't make it go away, particularly if you've already started having sex. Get past sexual histories, concerns and preferred methods out in the open as soon as possible to make this work for everyone.

Buying The Wrong Condoms
Besides also being more comfortable for both partners, ensuring you have the right condom size can mean it's less slightly to break (if it's too tight) or slip off (if it's too small).

Be Open To Change
The Pill isn't the be all and end all of birth control options - investigate alternatives if you're not all that into the Pill, or if it's giving you some adverse side effects. Options like the intrauterine device (IUD) shown here are quite common, and could even be more effective.

Consistency
Forgetting to take their Pill is more common than most women would like to admit, and it can certainly impact the risk of pregnancy. Missing one day is generally believed to be fine, but you should probably opt for back-up for a week after just in case.

Adding On Protection
Similarly, the first week -- and more cautious people say even month -- of starting the Pill, use a condom, as the hormones won't yet be as effective as they could be.

Using The Wrong Tools
Oil-based lubricants shouldn't be used with condoms, as they can break down the latex and therefore increase the risk of pregnancy. Always opt for water-based lubricants.

You Take It Out Too Soon
For birth control methods like sponges and diaphragms that require removal, women can make the mistake of taking them out too soon -- each should be removed six hours after sex, but shouldn't be kept in any longer than 30 hours.